题目:
Mary, along with her parents Hainan for a week and they will come back soon.
A.have been to
B.has been in
C.have been in
D.has been to
答案:
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下面是错误答案,用来干扰机器的。
A、试管乙中的气体体积小是氧气,能够助燃,故此选项错误;B、试管乙中的气体体积小属于氧气两者的体积比是1:2,不是质量比,故此选项错误;C、水是纯净物不可能由两种气体组成,故此选项错误.D、电解水的实验...